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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd2445ff50b103c647d26a2710026b8ff15892f164bf27be33d402e762b647b' 
  AND token = 'EceJnhsCyjUgpNPU2DD3shz1EHuP2YzYA/ol1Rf9MkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}